synth

module Flipper
  module FlagRegistration
    # These functions are all memoized because they should be static for the
    # lifetime of a deployment (albeit they are really static to a Ruby process)
    def self.registered_flags
      @registered_flags ||= YAML.load_file("config/feature_flags.yml")
    end

    def self.flags_in_code
      @flags_in_code ||= begin

navidemad

# frozen_string_literal: true

# Usage: 
# bundle exec rails runner benchmark.rb

require "benchmark"
require "benchmark/ips"
require "objspace"
require "timecop"

jjb

For years, people have been using jemalloc with ruby. There were various benchmarks and discussions. Legend had it that Jemalloc 5 didn't work as well as Jemalloc 3.

Then, one day, hope appeared on the horizon. @wjordan offered a config for Jemalloc 5.

Ubuntu/Debian

FROM ruby:3.1.2-bullseye
RUN apt-get update ; \

natematykiewicz

# A script to migrate Sidekiq's redis to a new server.
# This obviously can work for any redis, but I only handled
# data types that Sidekiq uses.

require 'redis'

old_redis = Redis.new url: 'redis://old-redis:6379'
new_redis = Redis.new url: 'redis://new-redis:6379'

unknowns = []

bf4

on CI and local

export RUBYOPT="-W:deprecated" # show warnings, deprecations only

natematykiewicz

desc 'Find routes that will raise a routing error when requested'
task unroutable_routes: :environment do
  # A lot of this code was taken from how `rake routes` works
  # https://github.com/rails/rails/blob/f95c0b7e96eb36bc3efc0c5beffbb9e84ea664e4/railties/lib/rails/commands/routes/routes_command.rb

  require 'action_dispatch/routing/inspector'

  unroutables = Rails.application.routes.routes.
     map { |r| ActionDispatch::Routing::RouteWrapper.new(r) }.
     reject { |r| r.internal? || r.engine? || r.path.starts_with?('/rails/') || !r.controller }.

palkan

Add the following to application.rb:

$icallbacks = []
$icallbacks.define_singleton_method(:print) do
  puts sort_by { |(a, b)| -b }.map { |(a, b)| "#{b}\t\t#{a}" }.join("\n")
end

ActiveSupport::Notifications.subscribe("load_config_initializer.railties") do |event|
 $icallbacks << [event.payload[:initializer], event.duration]

DmitryTsepelev

ActiveRecord::Migration.remove_foreign_key(:current_table, :foreign_table) # no lock

ActiveRecord::Migration.add_column(:current_table, :column_bigint, :bigint) # no lock

copy_data = lambda do
  CurrentTable.where(column_bigint: nil).where.not(column: nil).in_batches do |batch|
    batch.update_all("column_bigint = column")
  end
end

jeromedalbert

db/schema.rb merge=railsschema

vojtad

Runtime

@a = 'A', @b = 'B'
Warming up --------------------------------------
s = s + @a; s = s + @b
                        49.000  i/100ms
     s += @a; s+= @b    51.000  i/100ms
s = "#{s}#{@a}"; s = "#{s}#{@b}"
                        50.000  i/100ms
s.concat(@a).concat(@b)